Mike,

My comment on the more-horizontal runs was that there's such a long length of pipe to "burp". In a vertical drop, the burp bubble is right below the incoming drain to the durso.

Like I said, I'd seriously consider either upgrading your 1" holes to 1.5" holes, or at least upsizing your other plumbing. Upsizing won't help your total volume much, BUT it will eliminate 1" bends (which really restrict flow) and it will leave your 1" holes in the tank as the ONLY restrictions - and they are a lot easier to keep clean.